From 0a7b35cb18c52d651f6ed9cd59edc979200ab880 Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Sat, 10 Feb 2007 01:44:33 -0800 Subject: [PATCH] Add retain_initrd boot option Add retain_initrd option to control freeing of initrd memory after extraction. By default, free memory as previously. The first boot will need to hold a copy of the in memory fs for the second boot. This image can be large (much larger than the kernel), hence we can save time when the memory loader is slow. Also, it reduces the memory footprint while extracting the first boot since you don't need another copy of the fs. Signed-off-by: Michael Neuling Cc: "Randy.Dunlap" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- init/initramfs.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'init') diff --git a/init/initramfs.c b/init/initramfs.c index 4fa0f7977de..00eff7a1108 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -491,6 +491,17 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only) return message; } +static int __initdata do_retain_initrd; + +static int __init retain_initrd_param(char *str) +{ + if (*str) + return 0; + do_retain_initrd = 1; + return 1; +} +__setup("retain_initrd", retain_initrd_param); + extern char __initramfs_start[], __initramfs_end[]; #ifdef CONFIG_BLK_DEV_INITRD #include @@ -501,7 +512,11 @@ static void __init free_initrd(void) #ifdef CONFIG_KEXEC unsigned long crashk_start = (unsigned long)__va(crashk_res.start); unsigned long crashk_end = (unsigned long)__va(crashk_res.end); +#endif + if (do_retain_initrd) + goto skip; +#ifdef CONFIG_KEXEC /* * If the initrd region is overlapped with crashkernel reserved region, * free only memory that is not part of crashkernel region. @@ -519,7 +534,7 @@ static void __init free_initrd(void) } else #endif free_initrd_mem(initrd_start, initrd_end); - +skip: initrd_start = 0; initrd_end = 0; } -- cgit v1.2.3-70-g09d2 From c33df4eaaf41fd3e34837a6ae9a5f9970c393d9f Mon Sep 17 00:00:00 2001 From: Jean-Paul Saman Date: Sat, 10 Feb 2007 01:44:43 -0800 Subject: [PATCH] disable init/initramfs.c The file init/initramfs.c is always compiled and linked in the kernel vmlinux even when BLK_DEV_RAM and BLK_DEV_INITRD are disabled and the system isn't using any form of an initramfs or initrd. In this situation the code is only used to unpack a (static) default initial rootfilesystem. The current init/initramfs.c code. usr/initramfs_data.o compiles to a size of ~15 kbytes. Disabling BLK_DEV_RAM and BLK_DEV_INTRD shrinks the kernel code size with ~60 Kbytes. This patch avoids compiling in the code and data for initramfs support if CONFIG_BLK_DEV_INITRD is not defined. Instead of the initramfs code and data it uses a small routine in init/noinitramfs.c to setup an initial static default environment for mounting a rootfilesystem later on in the kernel initialisation process. The new code is: 164 bytes of size. The patch is separated in two parts: 1) doesn't compile initramfs code when CONFIG_BLK_DEV_INITRD is not set 2) changing all plaforms vmlinux.lds.S files to not reserve an area of PAGE_SIZE when CONFIG_BLK_DEV_INITRD is not set. [deweerdt@free.fr: warning fix] Signed-off-by: Jean-Paul Saman Cc: Al Viro Cc: Signed-off-by: Frederik Deweerdt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/block/Kconfig | 4 +++- init/Kconfig | 4 ++++ init/Makefile | 7 ++++++- init/noinitramfs.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++ usr/Makefile | 2 +- 5 files changed, 66 insertions(+), 3 deletions(-) create mode 100644 init/noinitramfs.c (limited to 'init') diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index 58c1debf86f..cacb1c816e3 100644 --- a/drivers/block/Kconfig +++ b/drivers/block/Kconfig @@ -417,8 +417,10 @@ config BLK_DEV_INITRD etc. See for details. If RAM disk support (BLK_DEV_RAM) is also included, this - also enables initial RAM disk (initrd) support. + also enables initial RAM disk (initrd) support and adds + 15 Kbytes (more on some other architectures) to the kernel size. + If unsure say Y. config CDROM_PKTCDVD tristate "Packet writing on CD/DVD media" diff --git a/init/Kconfig b/init/Kconfig index a3f83e2c825..ab694223104 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -280,8 +280,12 @@ config RELAY If unsure, say N. +if BLK_DEV_INITRD + source "usr/Kconfig" +endif + config CC_OPTIMIZE_FOR_SIZE bool "Optimize for size (Look out for broken compilers!)" default y diff --git a/init/Makefile b/init/Makefile index 633a268d270..0154aea1e52 100644 --- a/init/Makefile +++ b/init/Makefile @@ -2,7 +2,12 @@ # Makefile for the linux kernel. # -obj-y := main.o version.o mounts.o initramfs.o +obj-y := main.o version.o mounts.o +ifneq ($(CONFIG_BLK_DEV_INITRD),y) +obj-y += noinitramfs.o +else +obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o +endif obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o mounts-y := do_mounts.o diff --git a/init/noinitramfs.c b/init/noinitramfs.c new file mode 100644 index 00000000000..f4c1a3a1b8c --- /dev/null +++ b/init/noinitramfs.c @@ -0,0 +1,52 @@ +/* + * init/noinitramfs.c + * + * Copyright (C) 2006, NXP Semiconductors, All Rights Reserved + * Author: Jean-Paul Saman + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include +#include +#include +#include + +/* + * Create a simple rootfs that is similar to the default initramfs + */ +static int __init default_rootfs(void) +{ + int err; + + err = sys_mkdir("/dev", 0755); + if (err < 0) + goto out; + + err = sys_mknod((const char __user *) "/dev/console", + S_IFCHR | S_IRUSR | S_IWUSR, + new_encode_dev(MKDEV(5, 1))); + if (err < 0) + goto out; + + err = sys_mkdir("/root", 0700); + if (err < 0) + goto out; + + return 0; + +out: + printk(KERN_WARNING "Failed to create a rootfs\n"); + return err; +} +rootfs_initcall(default_rootfs); diff --git a/usr/Makefile b/usr/Makefile index 382702ad663..201f27f8cba 100644 --- a/usr/Makefile +++ b/usr/Makefile @@ -7,7 +7,7 @@ PHONY += klibcdirs # Generate builtin.o based on initramfs_data.o -obj-y := initramfs_data.o +obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o # initramfs_data.o contains the initramfs_data.cpio.gz image. # The image is included using .incbin, a dependency which is not -- cgit v1.2.3-70-g09d2 From 842f968f3fcdc475c95ec76a03b29c5147e87b54 Mon Sep 17 00:00:00 2001 From: "Robert P. J. Day" Date: Sat, 10 Feb 2007 01:46:23 -0800 Subject: [PATCH] Remove final reference to superfluous smp_commence() Remove the last (and commented out) invocation of the obsolete smp_commence() call. Signed-off-by: Robert P. J. Day Acked-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- init/main.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'init') diff --git a/init/main.c b/init/main.c index 8b4a7d76916..4e88bddfbeb 100644 --- a/init/main.c +++ b/init/main.c @@ -395,11 +395,6 @@ static void __init smp_init(void) /* Any cleanup work */ printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); smp_cpus_done(max_cpus); -#if 0 - /* Get other processors into their bootup holding patterns. */ - - smp_commence(); -#endif } #endif -- cgit v1.2.3-70-g09d2 From 18f705f49a5b19206233f7cef8f869ce7291f8c8 Mon Sep 17 00:00:00 2001 From: Alexey Dobriyan Date: Sat, 10 Feb 2007 01:46:44 -0800 Subject: [PATCH] Move TASK_XACCT, TASK_IO_ACCOUNTING up in menus Since they depends on TASKSTATS, it would be nice to move them closer to another options depending on TASKSTATS. Signed-off-by: Alexey Dobriyan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- init/Kconfig | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-) (limited to 'init') diff --git a/init/Kconfig b/init/Kconfig index ab694223104..ad33c979e0b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -192,6 +192,24 @@ config TASK_DELAY_ACCT Say N if unsure. +config TASK_XACCT + bool "Enable extended accounting over taskstats (EXPERIMENTAL)" + depends on TASKSTATS + help + Collect extended task accounting data and send the data + to userland for processing over the taskstats interface. + + Say N if unsure. + +config TASK_IO_ACCOUNTING + bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" + depends on TASK_XACCT + help + Collect information on the number of bytes of storage I/O which this + task has caused. + + Say N if unsure. + config UTS_NS bool "UTS Namespaces" default n @@ -299,24 +317,6 @@ config CC_OPTIMIZE_FOR_SIZE If unsure, say N. -config TASK_XACCT - bool "Enable extended accounting over taskstats (EXPERIMENTAL)" - depends on TASKSTATS - help - Collect extended task accounting data and send the data - to userland for processing over the taskstats interface. - - Say N if unsure. - -config TASK_IO_ACCOUNTING - bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" - depends on TASK_XACCT - help - Collect information on the number of bytes of storage I/O which this - task has caused. - - Say N if unsure. - config SYSCTL bool -- cgit v1.2.3-70-g09d2 From 30d7e0d466b3ac0b5ef77e4062bf9385f0d72270 Mon Sep 17 00:00:00 2001 From: Alon Bar-Lev Date: Mon, 12 Feb 2007 00:53:52 -0800 Subject: [PATCH] Dynamic kernel command-line: common Current implementation stores a static command-line buffer allocated to COMMAND_LINE_SIZE size. Most architectures stores two copies of this buffer, one for future reference and one for parameter parsing. Current kernel command-line size for most architecture is much too small for module parameters, video settings, initramfs paramters and much more. The problem is that setting COMMAND_LINE_SIZE to a grater value, allocates static buffers. In order to allow a greater command-line size, these buffers should be dynamically allocated or marked as init disposable buffers, so unused memory can be released. This patch renames the static saved_command_line variable into boot_command_line adding __initdata attribute, so that it can be disposed after initialization. This rename is required so applications that use saved_command_line will not be affected by this change. It reintroduces saved_command_line as dynamically allocated buffer to match the data in boot_command_line. It also mark secondary command-line buffer as __initdata, and copies it to dynamically allocated static_command_line buffer components may hold reference to it after initialization. This patch is for linux-2.6.20-rc4-mm1 and is divided to target each architecture. I could not check this in any architecture so please forgive me if I got it wrong. The per-architecture modification is very simple, use boot_command_line in place of saved_command_line. The common code is the change into dynamic command-line. This patch: 1. Rename saved_command_line into boot_command_line, mark as init disposable. 2. Add dynamic allocated saved_command_line. 3. Add dynamic allocated static_command_line. 4. During startup copy: boot_command_line into saved_command_line. arch command_line into static_command_line. 5. Parse static_command_line and not arch command_line, so arch command_line may be freed. Signed-off-by: Alon Bar-Lev Cc: Andi Kleen Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Russell King Cc: Ian Molton Cc: Mikael Starvik Cc: David Howells Cc: Yoshinori Sato Cc: Ralf Baechle Cc: Kyle McMartin Cc: Heiko Carstens Cc: Martin Schwidefsky Cc: Hirokazu Takata Cc: Paul Mundt Cc: Kazumoto Kojima Cc: Richard Curnow Cc: William Lee Irwin III Cc: "David S. Miller" Cc: Jeff Dike Cc: Paolo 'Blaisorblade' Giarrusso Cc: Miles Bader Cc: Chris Zankel Cc: "Luck, Tony" Cc: Geert Uytterhoeven Cc: Roman Zippel Cc: Greg Ungerer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/init.h | 5 +++-- init/main.c | 29 ++++++++++++++++++++++++----- 2 files changed, 27 insertions(+), 7 deletions(-) (limited to 'init') diff --git a/include/linux/init.h b/include/linux/init.h index c65f5107d51..e290a010e3f 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -67,7 +67,8 @@ extern initcall_t __con_initcall_start[], __con_initcall_end[]; extern initcall_t __security_initcall_start[], __security_initcall_end[]; /* Defined in init/main.c */ -extern char saved_command_line[]; +extern char __initdata boot_command_line[]; +extern char *saved_command_line; extern unsigned int reset_devices; /* used by init/main.c */ @@ -164,7 +165,7 @@ struct obs_kernel_param { #define early_param(str, fn) \ __setup_param(str, fn, fn, 1) -/* Relies on saved_command_line being set */ +/* Relies on boot_command_line being set */ void __init parse_early_param(void); #endif /* __ASSEMBLY__ */ diff --git a/init/main.c b/init/main.c index 4e88bddfbeb..4e9e92bb2b8 100644 --- a/init/main.c +++ b/init/main.c @@ -121,8 +121,12 @@ extern void time_init(void); void (*late_time_init)(void); extern void softirq_init(void); -/* Untouched command line (eg. for /proc) saved by arch-specific code. */ -char saved_command_line[COMMAND_LINE_SIZE]; +/* Untouched command line saved by arch-specific code. */ +char __initdata boot_command_line[COMMAND_LINE_SIZE]; +/* Untouched saved command line (eg. for /proc) */ +char *saved_command_line; +/* Command line for parameter parsing */ +static char *static_command_line; static char *execute_command; static char *ramdisk_execute_command; @@ -399,6 +403,20 @@ static void __init smp_init(void) #endif +/* + * We need to store the untouched command line for future reference. + * We also need to store the touched command line since the parameter + * parsing is performed in place, and we should allow a component to + * store reference of name/value for future reference. + */ +static void __init setup_command_line(char *command_line) +{ + saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); + static_command_line = alloc_bootmem(strlen (command_line)+1); + strcpy (saved_command_line, boot_command_line); + strcpy (static_command_line, command_line); +} + /* * We need to finalize in a non-__init function or else race conditions * between the root thread and the init thread may cause start_kernel to @@ -453,7 +471,7 @@ void __init parse_early_param(void) return; /* All fall through to do_early_param. */ - strlcpy(tmp_cmdline, saved_command_line, COMMAND_LINE_SIZE); + strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); parse_args("early options", tmp_cmdline, NULL, 0, do_early_param); done = 1; } @@ -503,6 +521,7 @@ asmlinkage void __init start_kernel(void) printk(KERN_NOTICE); printk(linux_banner); setup_arch(&command_line); + setup_command_line(command_line); unwind_setup(); setup_per_cpu_areas(); smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ @@ -520,9 +539,9 @@ asmlinkage void __init start_kernel(void) preempt_disable(); build_all_zonelists(); page_alloc_init(); - printk(KERN_NOTICE "Kernel command line: %s\n", saved_command_line); + printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); parse_early_param(); - parse_args("Booting kernel", command_line, __start___param, + parse_args("Booting kernel", static_command_line, __start___param, __stop___param - __start___param, &unknown_bootoption); if (!irqs_disabled()) { -- cgit v1.2.3-70-g09d2